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How to set oscillator frequency in microchip C (free XC8)

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T

treez

Guest
Hello,
I need to move 0x50 into the OSCCON register , but in C, the command "OSCCON = 0x50" gives an error.
Do you know how I do this, the manual does not say?

Here is my code so far..its for pic18f65k22 and is in mplab.x
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// * File:   3CH TEST.c
 
//;Code for 3 channel led driver on the 'updated_550587' PCB
//;WE ARE TRUNCATING THE ADC REGISTER SO JUST USE UPPER 8 BITS
//This code assumes LED MCPCB thermistors with B=3970 and 10K @ 25degC
//Make sure the current level is never changed more than about 4 times
//per second.
 
 
//;DEFINE INPUTS FROM DIPSWITCH
//;Note that the new board has pullups on the dipswitch,
//;whereas 550587 PCB had pull downs, thus logic is reversed.
//; XXX DIPSWITCH POLARITY:- XXX
//;DIP 1...ON = EXTERNAL CONNECTOR CONTROL
//;DIP 2...ON = LOGIC HIGH (note 'ON' gives a low input)
//;DIP 3...ON = LOGIC HIGH
//;DIP 4...OFF = 10V is for max current
//;DIP 5...OFF = 80degC, ON = 90degC
//;DIP 6... UNUSED
//;DIP 7... UNUSED
//;DIP 8...ON = NO FAN FITTED, OFF = FAN FITTED
//
//; XXX  EXTERNAL CONTROL CONNECTOR POLARITY:- XXX
//;CLEAR = ACTIVE HIGH
//;RESET = ACTIVE HIGH
//;CH1...HIGH = ON, LOW = OFF
//;CH2...HIGH = ON, LOW = OFF
//;CH3...HIGH = ON, LOW = OFF
//
//;List of input ports:
//; ************** DIPSWITCH INPUTS:
//;DIP1 = RB0
//;DIP2 = RB1
//;DIP3 = RB2
//;DIP4 = RB3
//;DIP5 = RB4
//;DIP6 = RB5
//;DIP7 = RC5
//;DIP8 = RE6
//
//;************* External connector INPUTS:
//;clear =       RC1
//;ch3 on/off =  RC7
//;RESET =       RD5
//;CH1 on/off =  RD6
//;ch2 on/off =  RD7
//
//;Other inputs (DIGITAL I/O
//;Fan tacho = RG2
//;mclr =      RG5
//
//;Inputs that are ADC inputs:
//;RA2 = AN2
//;RA3 = AN3
//;RA5 = AN4 ADCON0=0x10
//;RF1 = AN6 ADCON0=0x18
//;RF2 = AN7
//;RF3 = AN8
//;RF4 = AN9
//;RF5 = AN10 ADCON0=0x28
//;RF6 = AN11 ADCON0=0x2C
//;RF7 = AN5  ADCON0=0x1C
//
//;**********ADC INPUTS:
//;AN0 = NC
//;AN1 = NC
//;AN2 = VREF- (0V)
//;AN3 = VREF+ (3V)
//;AN4 = Therm ch1
//;AN5 = I_CH1
//;AN6 = 0-10V control input
//;AN7 = PCB thermistor
//;AN8 = I_ch2
//;AN9 = I_ch3
//;AN10 = Therm-ch2
//;AN11 = Therm-ch3
//
//;OOOOOOOOOOO LIST OF OUTPUTS:
//;Trip =          RA4
//;Indicator LED = RC2
//;MCP4013_CS =    RC3
//;MCP4013_UD =    RC4
//;Shutdown-Ch2 =  RE0
//;Shutdown-Ch1 =  RE1
//;Fancon PWM =    RE4
//;Shutdown-Ch3 =  RG0
//
//;NCNCNCNCNCNCNCNCNC LIST OF NON CONNECTED PINS:
//;RA0
//;RA1
//;RA6
//;RA7
//;    RB6  = PGC
//;    RB7  = PGD
//;RC0
//;RC6
//;    RD0
//;    RD1
//;    RD2
//;    RD3
//;    RD4
//;RE2
//;RE3
//;RE5
//;RE7
//;    RG1
//;    RG3
//;    RG4/*
#include <stdint.h>
#include <xc.h>
 
void    set_ana_dig_ports(void);
void    disable_interrupts(void);
void    disable_pullups(void);
void    disable_opendrain(void);
void    disable_comparators(void);
void    setup_adc(void);
void    setup_ports(void);
void    NC_pins_low(void);  //make all NC pins low.
void    read_dips(void);
void    set_initials_int(void);
void    set_initials_ext(void);
void    read_extreg5(void);
void    pre_internal(void);
void    pre_external(void);
void    set_initials_int(void); //dip/curr
void    set_initials_ext(void); //dip/curr
void    externalmode(void);
void    internalmode(void);
void    set_current_int(void);
void    set_current_ext_AH(void);
void    set_current_ext_AL(void);
void    setcurrent_ext(void);
void    top_mcp4013(void);
void    int_change(void);
void    ext_change(void);
void    change_current_int(void);
void    change_current_ext(void);
 
//CONFIGS
 
/*DEFINE OUTPUTS*/
#define ch1out      LATEbits.LATE1
#define ch2out      LATEbits.LATE0
#define ch3out      LATGbits.LATG0
#define ind_ledout  LATCbits.LATC2
#define fanconout   LATEbits.LATE4
#define tripout     LATAbits.LATA4
#define mcp4013_csout  LATCbits.LATC3
#define mcp4013_udout  LATCbits.LATC4
//DIPSWITCH INPUTS
#define dip1pin     PORTBbits.RB0
#define dip2pin     PORTBbits.RB1
#define dip3pin     PORTBbits.RB2
#define dip4pin     PORTBbits.RB3
#define dip5pin     PORTBbits.RB4
#define dip6pin     PORTBbits.RB5
#define dip7pin     PORTCbits.RC5
#define dip8pin     PORTEbits.RE6
 
//DEFINE INPUTS FROM EXT. CONNECTOR
#define resetext       PORTDbits.RD5
#define ch1ext    PORTDbits.RD6
#define ch2ext    PORTDbits.RD7
#define ch3ext    PORTCbits.RC7
#define clearext       PORTCbits.RC1
 
/* TURN LEDS ON AND OFF*/
#define ON1    LATEbits.LATE1 = 1;  /*Turn on chan1*/
#define OFF1   LATEbits.LATE1 = 0;  /*Turn off chan1*/
#define ON2    LATEbits.LATE0 = 1; /*Turn on chan2*/
#define OFF2   LATEbits.LATE0 = 0; /*Turn off chan2*/
#define ON3    LATGbits.LATG0 = 1; /*Turn on chan2*/
#define OFF3   LATGbits.LATG0 = 0;  /*Turn off chan2*/
#define FANON  LATEbits.LATE2 = 1;   /*Turn fan on*/
#define FANOFF LATEbits.LATE2 = 0;  /*Turn fan off*/
 
/*DEFINE INPUTS FROM DIPSWITCH*/
/*Note that the new board has pullups on the dipswitch,*/
/*whereas 550587 PCB had pull downs, thus logic is reversed.*/
uint8_t    dipsw1;
uint8_t    dipsw2;
uint8_t    dipsw3;
uint8_t    dipsw4;
uint8_t    dipsw5;
uint8_t    dipsw8;
uint8_t    dip8;   //bit0=dip1...
uint8_t    dip8_init;
uint8_t    extreg5;    //bit0=reset,bit1=ch1...etc, to bit4=clear
                            //external connector pins
uint8_t    extreg5_init;
uint8_t    extp3;    //reset
uint8_t    extp4;    //ch1
uint8_t    extp5;    //ch2
uint8_t    extp6;    //ch3
uint8_t    extp9;    //an in
uint8_t    extp10;   //clear
uint8_t    extp11;   //TRIP OUT
uint8_t    temp1;
uint8_t    temp2;
uint8_t    temp3;
uint8_t    tempb;
uint8_t    ana8;           //holds ADRESH
uint8_t    ana8_init;
uint8_t    max_led_temp;
uint8_t    max_pcb_temp;
uint8_t    board_90c;      //max board temp value
uint8_t    board_80c;
uint8_t    led_90c;
uint8_t    led_80c;        //max led temp value
uint8_t    ledthermopen;   //trip value when thermistor open
uint8_t    pcbthermopen;
uint8_t    currentint;        //represents 0A, 1.76A, 2.64A, 3.52A
                                //bit0=0,bit1=1a76...etc
uint8_t    iset_mcp4013;   //numer of down pulses needed to get current.
uint8_t    mcp4013pulses;
uint8_t    i;
uint8_t    just_lsbmsb_init;
uint8_t    just_lsbmsb;
uint8_t    extreg5;
uint8_t    extp3;
uint8_t    extp4;
uint8_t    extp5;
uint8_t    extp6;
uint8_t    extp10;
 
void main(void) {
   
    disable_interrupts();
    disable_pullups();
    disable_opendrain();
    disable_comparators();
    setup_adc();
    setup_ports();
    NC_pins_low();  //make all NC pins low.
 
    here:
    while(1){
    OFF1;
    OFF2;
    OFF3;
    FANOFF;
 
    read_dips();
    if (currentint == 1) {goto  here;}
 
    here_1:
    if (dipsw1)  pre_internal();  //OFF (actually high) = INTERNAL MODE
    if (currentint == 1) {goto  here;}
    if (dipsw1)  internalmode();
    if (currentint == 1) {goto  here;}
    if (dipsw1) {goto    here_1;}
 
    if (!dipsw1) pre_external();
    if (currentint == 1) {goto  here;}
    if  (!dipsw1) externalmode();
    if  (currentint == 1) {goto  here;}
    goto    here_1;
    }
    return;
}
void    set_ana_dig_ports(void){
    ANCON0 = 0xFC;
    ANCON1 = 0x0F;
    ANCON2 = 0x00;
    return;
}
void    disable_interrupts(void) {
    INTCON =0x00;
    INTCON2 =0x80;
    INTCON3 = 0x00;
    PIE1 = 0x00;
    PIE2 = 0x00;
    PIE3 = 0x00;
    PIE4 = 0x00;
    PIE5 = 0x00;
    PIE6 = 0x00;
    return;
}
void    disable_pullups(void){
    PADCFG1 = 0;
    return;
}
void    disable_opendrain(void){
    ODCON1 = 0;
    ODCON2 = 0;
    ODCON3 = 0;
    return;
}
void    disable_comparators(void){
    CM1CON = 0;
    CM2CON = 0;
    CM3CON = 0;
    return;
}
void    setup_adc(void){
    ADCON0 = 0;
    ADCON1 = 0x10;  //VREF
    ADCON2 = 0x3E;  // Left jus/Tacq
    return;
}
void    setup_ports(void){
    TRISA =   0x2C;
    TRISB   = 0x3F;
    TRISC   = 0xA2;
    TRISD   = 0xD0;
    TRISE   = 0x40;
    TRISF   = 0xFE;
    TRISG   = 0x24;
    return;
}
void    NC_pins_low(void){
//Make all NC pins low (they are already made to outputs)
//They are outputs for noise immunity reasons.
    LATAbits.LATA0 = 0;
    LATAbits.LATA1 = 0;
    LATAbits.LATA6 = 0;
    LATAbits.LATA7 = 0;
 
    LATBbits.LATB6  = 0;    //PGC
    LATBbits.LATB7  = 0;    //PGD
 
    LATCbits.LATC0 = 0;
    LATCbits.LATC6 = 0;
 
    LATDbits.LATD0 = 0;
    LATDbits.LATD1 = 0;
    LATDbits.LATD2 = 0;
    LATDbits.LATD3 = 0;
    LATDbits.LATD4 = 0;
 
    LATEbits.LATE2 = 0;
    LATEbits.LATE3 = 0;
    LATEbits.LATE5 = 0;
    LATEbits.LATE7 = 0;
 
    LATGbits.LATG1 = 0;
    LATGbits.LATG3 = 0;
    LATGbits.LATG4 = 0;
    return;
}
void    read_extreg5(void){
    //read just the five digital inputs from ext conn.
    //put them in extreg5;
    extreg5 = 0x00;    //first 5 bits of ext5 holds ext conn res,1,2,3,cl
    if (resetext) {extp3 = 0x01; extreg5 = extreg5 || 0x01;}
    else    {extp3 = 0x00;}
    if (ch1ext) {extp4 = 0x01; extreg5 = extreg5 || 0x02;}
    else    {extp4 = 0x00;}
    if (ch2ext) {extp5 = 0x01; extreg5 = extreg5 || 0x04;}
    else    {extp5 = 0x00;}
    if (ch3ext) {extp6 = 0x01; extreg5 = extreg5 || 0x08;}
    else    {extp6 = 0x00;}
    if (clearext) {extp10 = 0x01; extreg5 = extreg5 || 0x10;}
    else    {extp10 = 0x00;}
    return;
}
void    read_dips(void){
    //dip8 holds the state of dipswitch in correcponding bit places.
    dip8 = 0x00;
    if (dip1pin) {dipsw1 = 0x01; dip8 = dip8 || 0x01;}
    else    {dipsw1 = 0x00;}
    if (dip2pin) {dipsw2 = 0x01; dip8 = dip8 || 0x02;}
    else    {dipsw2 = 0x00;}
    if (dip3pin) {dipsw3 = 0x01; dip8 = dip8 || 0x04;}
    else    {dipsw3 = 0x00;}
    if (dip4pin) {dipsw4 = 0x01; dip8 = dip8 || 0x08;}
    else    {dipsw4 = 0x00;}
    if (dip5pin) {dipsw5 = 0x01; dip8 = dip8 || 0x10;}
    else    {dipsw5 = 0x00;}
    if (dip8pin) {dipsw8 = 0x01; dip8 = dip8 || 0x80;}
    else    {dipsw8 = 0x00;}
    if (!dipsw2 && !dipsw3) {currentint = 4;}   //set the currentint reg
    if (dipsw2 && !dipsw3)  {currentint = 3;}
    if (!dipsw2 && dipsw3)  {currentint = 2;}
    if (dipsw2 && dipsw3)   {currentint = 1;}
    return;
}
 
void    read_analog(void){
    ADCON0 = 0x19;  //turn on ADC module FOR AN6 (0-10V)
    ADCON0 = 0x1B;  //START ADC CONVERSION
    while(GODONE) {;}   //Wait till conversion complete.
    ana8 = ADRESH;
    ADCON0 = 0x18;  //turn off ADC MODULE.
    return;
}
void    set_initials_int(void){
    read_dips();
    dip8_init = dip8;                   //for comparison
    return;
}
void    set_initials_ext(void){
    read_dips();
    dip8_init = dip8;                   //for comparison
    read_extreg5();
    extreg5_init = extreg5;
    read_analog();       //read the 0-10v signal.
    ana8_init = ana8;   //0-10V signal
return;
}
void    pre_internal(void){
    set_initials_int();
    set_current_int();
    return;
    }
void    pre_external(void){
    set_initials_ext();
    if (dipsw4) {set_current_ext_AH();}
    if (!dipsw4) {set_current_ext_AL();}
    return;
    ;}
void    internalmode(void){
    while(1){
    __delay_ms(100);
    read_dips();
    if (dip8 != dip8_init) {break;}
    ON1;
    ON2;
    ON3;   }
return;}
 
void    externalmode(void) {
        while(1){
    __delay_ms(100);
    read_dips();
    if (dip8 != dip8_init) {break;}
    read_extreg5();
    if (extreg5 != extreg5_init){break;}
    read_analog();
    if (ana8 != ana8_init) {break;}
    if (extp3 == 1) {ON1;}
    if (extp3 == 1) {ON2;}
    if (extp3 == 1) {ON3;}
 
    if (extp3 == 0) {OFF1;}
    if (extp3 == 0) {OFF2;}
    if (extp3 == 0) {OFF3;}
        }
    return;
}
 
void    set_current_int(void){
    //set mcp4013 by topping the mcp4013, then decrementing
    if (currentint == 2) mcp4013pulses = 31;    //no. of downpulses.
    if (currentint == 3) mcp4013pulses = 17;
    if (currentint == 4) mcp4013pulses = 4;
    top_mcp4013();      //top out the mcp4013
    mcp4013_csout = 1;  //disable mcp4013
    mcp4013_csout = 1;
    mcp4013_udout = 0;  //ready to decrement
    mcp4013_udout = 0;
    mcp4013_csout = 0;  //enable mcp4013
    mcp4013_csout = 0;
    for (i== 0; i== mcp4013pulses; i++){
    mcp4013_udout = 1;  //pulse it to the level
    mcp4013_udout = 1;
    mcp4013_udout = 0;
    mcp4013_udout = 0;
    }
    mcp4013_csout = 1;
    mcp4013_csout = 1;  //disable mcp4013
    return;
}
void    top_mcp4013(void) {
        mcp4013_csout = 1;
        mcp4013_csout = 1;  //disable mcp4013
        mcp4013_udout = 1;  //ready to increment wiper
        mcp4013_udout = 1;
        mcp4013_csout = 0;  //enable mcp4013
        mcp4013_csout = 0;
        for(i==64;i==0;i--){
        mcp4013_udout = 0;
        mcp4013_udout = 0;
        mcp4013_udout = 1;
        mcp4013_udout = 1;
        }
        mcp4013_csout = 1;  //disable mcp4013
        mcp4013_csout = 1;
        return;
}
 
void    set_current_ext_AH(void){
    //This is to set the current in external mode when the 4th dipswitch
    //asks for the 0-10V signal to be "10V = Highest current"
    //["AH" stands for Active High"]
    //MCP4013pulses will here be the number of downpulses to pulse the digital
    //pot with. (starting from the top of the resistor 'chain')
    //Never go below 11 POT steps (ie, never below 0.176V -> 300mA)
    //Make max current correspond to 235bits to 255bits on the 0-10V input
    //(9.2V)
 
//CALCULATING NUMBER OF DOWNPULSES.
    if (currentint == 2) {
    //9 apart
    if ((ana8 >= 235) && (ana8 <= 255)) {mcp4013pulses = 31;}
    if ((ana8 >= 225) && (ana8 <= 234)) {mcp4013pulses = 32;}
    if ((ana8 >= 215) && (ana8 <= 224)) {mcp4013pulses = 33;}
    if ((ana8 >= 205) && (ana8 <= 214)) {mcp4013pulses = 34;}
    if ((ana8 >= 195) && (ana8 <= 204)) {mcp4013pulses = 35;}
    if ((ana8 >= 185) && (ana8 <= 194)) {mcp4013pulses = 36;}
    if ((ana8 >= 175) && (ana8 <= 184)) {mcp4013pulses = 37;}
    if ((ana8 >= 165) && (ana8 <= 174)) {mcp4013pulses = 38;}
    if ((ana8 >= 155) && (ana8 <= 164)) {mcp4013pulses = 39;}
    if ((ana8 >= 145) && (ana8 <= 154)) {mcp4013pulses = 40;}
    if ((ana8 >= 135) && (ana8 <= 144)) {mcp4013pulses = 41;}
    if ((ana8 >= 125) && (ana8 <= 134)) {mcp4013pulses = 42;}
    if ((ana8 >= 115) && (ana8 <= 124)) {mcp4013pulses = 43;}
    if ((ana8 >= 105) && (ana8 <= 114)) {mcp4013pulses = 44;}
    if ((ana8 >= 95) && (ana8 <= 104))  {mcp4013pulses = 45;}
    if ((ana8 >= 85) && (ana8 <= 94))   {mcp4013pulses = 46;}
    if ((ana8 >= 75) && (ana8 <= 84))   {mcp4013pulses = 47;}
    if ((ana8 >= 65) && (ana8 <= 74))   {mcp4013pulses = 48;}
    if ((ana8 >= 55) && (ana8 <= 64))   {mcp4013pulses = 49;}
    if ((ana8 >= 45) && (ana8 <= 54))   {mcp4013pulses = 50;}
    if ((ana8 >= 35) && (ana8 <= 44))   {mcp4013pulses = 51;}
    if ((ana8 >= 25) && (ana8 <= 34))   {mcp4013pulses = 52;}
    if ((ana8 >= 0) && (ana8 <= 24))    {mcp4013pulses = 53;}
    }
 
    if (currentint == 3) {
     //6 apart
    if ((ana8 >= 235) && (ana8 <= 255)) {mcp4013pulses = 17;}
    if ((ana8 >= 228) && (ana8 <= 234)) {mcp4013pulses = 18;}
    if ((ana8 >= 221) && (ana8 <= 227)) {mcp4013pulses = 19;}
    if ((ana8 >= 214) && (ana8 <= 220)) {mcp4013pulses = 20;}
    if ((ana8 >= 207) && (ana8 <= 213)) {mcp4013pulses = 21;}
    if ((ana8 >= 200) && (ana8 <= 206)) {mcp4013pulses = 22;}
    if ((ana8 >= 193) && (ana8 <= 199)) {mcp4013pulses = 23;}
    if ((ana8 >= 186) && (ana8 <= 192)) {mcp4013pulses = 24;}
    if ((ana8 >= 179) && (ana8 <= 185)) {mcp4013pulses = 25;}
    if ((ana8 >= 172) && (ana8 <= 178)) {mcp4013pulses = 26;}
    if ((ana8 >= 165) && (ana8 <= 171)) {mcp4013pulses = 27;}
    if ((ana8 >= 158) && (ana8 <= 164)) {mcp4013pulses = 28;}
    if ((ana8 >= 151) && (ana8 <= 157)) {mcp4013pulses = 29;}
    if ((ana8 >= 144) && (ana8 <= 150)) {mcp4013pulses = 30;}
    if ((ana8 >= 137) && (ana8 <= 143)) {mcp4013pulses = 31;}
    if ((ana8 >= 130) && (ana8 <= 136)) {mcp4013pulses = 32;}
    if ((ana8 >= 123) && (ana8 <= 129)) {mcp4013pulses = 33;}
    if ((ana8 >= 116) && (ana8 <= 122)) {mcp4013pulses = 34;}
    if ((ana8 >= 109) && (ana8 <= 115)) {mcp4013pulses = 35;}
    if ((ana8 >= 102) && (ana8 <= 108)) {mcp4013pulses = 36;}
    if ((ana8 >= 95) && (ana8 <= 101))  {mcp4013pulses = 37;}
    if ((ana8 >= 88) && (ana8 <= 94))   {mcp4013pulses = 38;}
    if ((ana8 >= 81) && (ana8 <= 87))   {mcp4013pulses = 39;}
    if ((ana8 >= 74) && (ana8 <= 80))   {mcp4013pulses = 40;}
    if ((ana8 >= 67) && (ana8 <=73))    {mcp4013pulses = 41;}
    if ((ana8 >= 60) && (ana8 <= 66))   {mcp4013pulses = 42;}
    if ((ana8 >= 53) && (ana8 <= 59))   {mcp4013pulses = 43;}
    if ((ana8 >= 46) && (ana8 <= 52))   {mcp4013pulses = 44;}
    if ((ana8 >= 39) && (ana8 <= 45))   {mcp4013pulses = 45;}
    if ((ana8 >= 32) && (ana8 <= 38))   {mcp4013pulses = 46;}
    if ((ana8 >= 25) && (ana8 <= 31))   {mcp4013pulses = 47;}
    if ((ana8 >= 18) && (ana8 <= 24))   {mcp4013pulses = 48;}
    if ((ana8 >= 11) && (ana8 <= 17))   {mcp4013pulses = 49;}
    if ((ana8 >= 4) &&  (ana8 <= 10))   {mcp4013pulses = 50;}
    if ((ana8 >= 0) &&  (ana8 <= 3))    {mcp4013pulses = 50;}
    }
 
    if (currentint == 4){
    //4 apart
    if ((ana8 >= 235) && (ana8 <= 255)) {mcp4013pulses = 4;}
    if ((ana8 >= 230) && (ana8 <= 234)) {mcp4013pulses = 5;}
    if ((ana8 >= 225) && (ana8 <= 229)) {mcp4013pulses = 6;}
    if ((ana8 >= 220) && (ana8 <= 224)) {mcp4013pulses = 7;}
    if ((ana8 >= 215) && (ana8 <= 219)) {mcp4013pulses = 8;}
    if ((ana8 >= 210) && (ana8 <= 214)) {mcp4013pulses = 9;}
    if ((ana8 >= 205) && (ana8 <= 209)) {mcp4013pulses = 10;}
    if ((ana8 >= 200) && (ana8 <= 204)) {mcp4013pulses = 11;}
    if ((ana8 >= 195) && (ana8 <= 199)) {mcp4013pulses = 12;}
    if ((ana8 >= 190) && (ana8 <= 194)) {mcp4013pulses = 13;}
    if ((ana8 >= 185) && (ana8 <= 189)) {mcp4013pulses = 14;}
    if ((ana8 >= 180) && (ana8 <= 184)) {mcp4013pulses = 15;}
    if ((ana8 >= 175) && (ana8 <= 179)) {mcp4013pulses = 16;}
    if ((ana8 >= 170) && (ana8 <= 174)) {mcp4013pulses = 17;}
    if ((ana8 >= 165) && (ana8 <= 169)) {mcp4013pulses = 18;}
    if ((ana8 >= 160) && (ana8 <= 164)) {mcp4013pulses = 19;}
    if ((ana8 >= 155) && (ana8 <= 159)) {mcp4013pulses = 20;}
    if ((ana8 >= 150) && (ana8 <= 154)) {mcp4013pulses = 21;}
    if ((ana8 >= 145) && (ana8 <= 149)) {mcp4013pulses = 22;}
    if ((ana8 >= 140) && (ana8 <= 144)) {mcp4013pulses = 23;}
    if ((ana8 >= 135) && (ana8 <= 139)) {mcp4013pulses = 24;}
    if ((ana8 >= 130) && (ana8 <= 134)) {mcp4013pulses = 25;}
    if ((ana8 >= 125) && (ana8 <= 129)) {mcp4013pulses = 26;}
    if ((ana8 >= 120) &&  (ana8 <= 124)) {mcp4013pulses = 27;}
    if ((ana8 >= 115) &&  (ana8 <= 119))  {mcp4013pulses = 28;}
    if ((ana8 >= 110) &&  (ana8 <= 114))  {mcp4013pulses = 29;}
    if ((ana8 >= 105) &&  (ana8 <= 109))  {mcp4013pulses = 30;}
    if ((ana8 >= 100) &&  (ana8 <= 104))  {mcp4013pulses = 31;}
    if ((ana8 >= 95) &&  (ana8 <= 99))  {mcp4013pulses = 32;}
    if ((ana8 >= 90) &&  (ana8 <= 94))  {mcp4013pulses = 33;}
    if ((ana8 >= 85) &&  (ana8 <= 89))  {mcp4013pulses = 34;}
    if ((ana8 >= 80) &&  (ana8 <= 84))  {mcp4013pulses = 35;}
    if ((ana8 >= 75) &&  (ana8 <= 79))  {mcp4013pulses = 36;}
    if ((ana8 >= 70) &&  (ana8 <= 74))  {mcp4013pulses = 37;}
    if ((ana8 >= 65) &&  (ana8 <= 69))  {mcp4013pulses = 38;}
    if ((ana8 >= 60) &&  (ana8 <= 64))  {mcp4013pulses = 39;}
    //3 apart
    if ((ana8 >= 56) &&  (ana8 <= 59))  {mcp4013pulses = 40;}
    if ((ana8 >= 52) &&  (ana8 <= 55))  {mcp4013pulses = 41;}
    if ((ana8 >= 48) &&   (ana8 <= 51)) {mcp4013pulses = 42;}
    if ((ana8 >= 44) &&   (ana8 <= 47)) {mcp4013pulses = 43;}
    if ((ana8 >=40) &&  (ana8 <= 43))   {mcp4013pulses = 39;}
    if ((ana8 >= 36) &&  (ana8 <= 39))  {mcp4013pulses = 40;}
    if ((ana8 >= 32) &&  (ana8 <= 35))  {mcp4013pulses = 41;}
    if ((ana8 >= 28) &&   (ana8 <= 31))  {mcp4013pulses = 42;}
    if ((ana8 >= 24) &&   (ana8 <= 27))   {mcp4013pulses = 43;}
    if ((ana8 >= 20) &&  (ana8 <= 23))  {mcp4013pulses =44;}
    if ((ana8 >= 16) &&  (ana8 <= 19))  {mcp4013pulses = 45;}
    if ((ana8 >= 12) &&  (ana8 <= 15))  {mcp4013pulses = 46;}
    if ((ana8 >= 8) &&   (ana8 <= 11))   {mcp4013pulses = 47;}
    if ((ana8 >= 4) &&  (ana8 <= 7))    {mcp4013pulses =48;}
    if ((ana8 >= 0) &&  (ana8 <= 3))    {mcp4013pulses = 49;}
    }
 
    top_mcp4013();      //top out the mcp4013
    mcp4013_csout = 1;  //disable mcp4013
    mcp4013_csout = 1;
    mcp4013_udout = 0;  //ready to decrement
    mcp4013_udout = 0;
    mcp4013_csout = 0;  //enable mcp4013
    mcp4013_csout = 0;
    for (i== 0; i== mcp4013pulses; i++){
    mcp4013_udout = 1;  //pulse it to the level
    mcp4013_udout = 1;
    mcp4013_udout = 0;
    mcp4013_udout = 0;
    }
    mcp4013_csout = 1;
    mcp4013_csout = 1;  //disable mcp4013
 
    return;
}
 
void    set_current_ext_AL(void){
    //This is to set the current in external mode when the 4th dipswitch
    //asks for the 0-10V signal to be "0V = Highest current"
    //["AL" stands for Active Low"]
    //MCP4013pulses will here be the number of downpulses to pulse the digital
    //pot with. (starting from the top of the resistor 'chain')
    //Never go below 11 POT steps (ie, never below 0.176V -> 300mA)
    //Make max current correspond to 0 bits to 9 bits on the 0-10V input
    //(ie anything below 0.3V will be max)
    if (currentint == 2) {
    //12 apart
    if ((ana8 >= 0  )  && (ana8 <= 9))   {mcp4013pulses = 31;}
    if ((ana8 >= 10  ) && (ana8 <= 22))  {mcp4013pulses = 32;}
    if ((ana8 >= 23  ) && (ana8 <= 35))  {mcp4013pulses = 33;}
    if ((ana8 >= 36  ) && (ana8 <= 48))  {mcp4013pulses = 34;}
    if ((ana8 >= 49  ) && (ana8 <= 61))  {mcp4013pulses = 35;}
    if ((ana8 >= 62  ) && (ana8 <= 74))  {mcp4013pulses = 36;}
    if ((ana8 >= 75  ) && (ana8 <= 87))  {mcp4013pulses = 37;}
    if ((ana8 >= 88  ) && (ana8 <= 100))  {mcp4013pulses = 38;}
    if ((ana8 >= 101  ) && (ana8 <= 113))  {mcp4013pulses = 39;}
    if ((ana8 >= 114  ) && (ana8 <= 126))  {mcp4013pulses = 40;}
    if ((ana8 >= 127  ) && (ana8 <= 139))  {mcp4013pulses = 41;}
    if ((ana8 >= 140 ) && (ana8 <= 152))  {mcp4013pulses = 42;}
    if ((ana8 >= 153  ) && (ana8 <= 165)) {mcp4013pulses = 43;}
    if ((ana8 >= 166  ) && (ana8 <= 178)) {mcp4013pulses = 44;}
    if ((ana8 >= 179  ) && (ana8 <= 191)) {mcp4013pulses = 45;}
    if ((ana8 >= 192 )  && (ana8 <= 204)) {mcp4013pulses = 46;}
    if ((ana8 >= 205  ) && (ana8 <= 217)) {mcp4013pulses = 47;}
    if ((ana8 >= 218  ) && (ana8 <= 230)) {mcp4013pulses = 48;}
    if ((ana8 >= 231  ) && (ana8 <= 243)) {mcp4013pulses = 49;}
    if ((ana8 >= 244 )  && (ana8 <= 255)) {mcp4013pulses = 50;}
    }
    if (currentint == 3) {
    //7 apart
    if ((ana8 >= 0  )  && (ana8 <= 9))     {mcp4013pulses = 17;}
    if ((ana8 >= 10  )  && (ana8 <= 17))   {mcp4013pulses = 18;}
    if ((ana8 >= 18  )  && (ana8 <= 25))   {mcp4013pulses = 19;}
    if ((ana8 >= 26  )  && (ana8 <= 33))   {mcp4013pulses = 20;}
    if ((ana8 >= 34  )  && (ana8 <= 41))   {mcp4013pulses = 21;}
    if ((ana8 >= 42  )  && (ana8 <= 49))   {mcp4013pulses = 22;}
    if ((ana8 >= 50  )  && (ana8 <= 57))   {mcp4013pulses = 23;}
    if ((ana8 >= 58  )  && (ana8 <= 65))   {mcp4013pulses = 24;}
    if ((ana8 >= 66  )  && (ana8 <= 73))   {mcp4013pulses = 25;}
    if ((ana8 >= 74  )  && (ana8 <= 81))   {mcp4013pulses = 26;}
    if ((ana8 >= 82  )  && (ana8 <= 89))   {mcp4013pulses = 27;}
    if ((ana8 >= 90  )  && (ana8 <= 97))   {mcp4013pulses = 28;}
    if ((ana8 >= 98  )  && (ana8 <= 105))  {mcp4013pulses = 29;}
    if ((ana8 >= 106 )  && (ana8 <= 113))  {mcp4013pulses = 30;}
    if ((ana8 >= 114  )  && (ana8 <= 121)) {mcp4013pulses = 31;}
    if ((ana8 >= 122  )  && (ana8 <= 129)) {mcp4013pulses = 32;}
    if ((ana8 >= 130  )  && (ana8 <= 137)) {mcp4013pulses = 33;}
    if ((ana8 >= 138  )  && (ana8 <= 145)) {mcp4013pulses = 34;}
    if ((ana8 >= 146  )  && (ana8 <= 153)) {mcp4013pulses = 35;}
    if ((ana8 >= 154 )  && (ana8 <= 161))  {mcp4013pulses = 36;}
    if ((ana8 >= 162  )  && (ana8 <= 169)) {mcp4013pulses = 37;}
    if ((ana8 >= 170  )  && (ana8 <= 177)) {mcp4013pulses = 38;}
    if ((ana8 >= 178  )  && (ana8 <= 185)) {mcp4013pulses = 39;}
    if ((ana8 >= 186 )  && (ana8 <= 193))  {mcp4013pulses = 40;}
    if ((ana8 >= 194 )  && (ana8 <= 201))  {mcp4013pulses = 41;}
    if ((ana8 >= 202  )  && (ana8 <= 209)) {mcp4013pulses = 42;}
    if ((ana8 >= 210  )  && (ana8 <= 217)) {mcp4013pulses = 43;}
    if ((ana8 >= 218  )  && (ana8 <= 225)) {mcp4013pulses = 44;}
    if ((ana8 >= 226 )  && (ana8 <= 233))  {mcp4013pulses = 45;}
    if ((ana8 >= 234 )  && (ana8 <= 241))  {mcp4013pulses = 46;}
    if ((ana8 >= 242  )  && (ana8 <= 249)) {mcp4013pulses = 47;}
    if ((ana8 >= 250  )  && (ana8 <= 255)) {mcp4013pulses = 48;}
    }
    if (currentint == 4)    {
    //4 apart
    if ((ana8 >= 0  )  && (ana8 <= 9))     {mcp4013pulses = 4;}
    if ((ana8 >= 10  )  && (ana8 <= 14))   {mcp4013pulses = 5;}
    if ((ana8 >= 15  )  && (ana8 <= 19))   {mcp4013pulses = 6;}
    if ((ana8 >= 20  )  && (ana8 <= 24))   {mcp4013pulses = 7;}
    if ((ana8 >= 25  )  && (ana8 <= 29))   {mcp4013pulses = 8;}
    if ((ana8 >= 30  )  && (ana8 <= 34))   {mcp4013pulses = 9;}
    if ((ana8 >= 35  )  && (ana8 <= 39))   {mcp4013pulses = 10;}
    if ((ana8 >= 40  )  && (ana8 <= 44))   {mcp4013pulses = 11;}
    if ((ana8 >= 45  )  && (ana8 <= 49))   {mcp4013pulses = 12;}
    if ((ana8 >= 50  )  && (ana8 <= 54))   {mcp4013pulses = 13;}
    if ((ana8 >= 55  )  && (ana8 <= 59))   {mcp4013pulses = 14;}
    if ((ana8 >= 60  )  && (ana8 <= 64))   {mcp4013pulses = 15;}
    if ((ana8 >= 65  )  && (ana8 <= 69))  {mcp4013pulses = 16;}
    if ((ana8 >= 70  )  && (ana8 <= 74))   {mcp4013pulses = 17;}
    if ((ana8 >= 75  )  && (ana8 <= 79))   {mcp4013pulses = 18;}
    if ((ana8 >= 80  )  && (ana8 <= 84))   {mcp4013pulses = 19;}
    if ((ana8 >= 85  )  && (ana8 <= 89))   {mcp4013pulses = 20;}
    if ((ana8 >= 90  )  && (ana8 <= 94))   {mcp4013pulses = 21;}
    if ((ana8 >= 95  )  && (ana8 <= 99))   {mcp4013pulses = 22;}
    if ((ana8 >= 100  )  && (ana8 <= 104))   {mcp4013pulses = 23;}
    if ((ana8 >= 105  )  && (ana8 <= 109))   {mcp4013pulses = 24;}
    if ((ana8 >= 110  )  && (ana8 <= 114))   {mcp4013pulses = 25;}
    if ((ana8 >= 115  )  && (ana8 <= 119))   {mcp4013pulses = 26;}
    if ((ana8 >= 120  )  && (ana8 <= 124))   {mcp4013pulses = 27;}
    if ((ana8 >= 125  )  && (ana8 <= 129))   {mcp4013pulses = 28;}
    if ((ana8 >= 130  )  && (ana8 <= 134))   {mcp4013pulses = 29;}
    if ((ana8 >= 135  )  && (ana8 <= 139))   {mcp4013pulses = 30;}
    if ((ana8 >= 140  )  && (ana8 <= 144))   {mcp4013pulses = 31;}
    if ((ana8 >= 145  )  && (ana8 <= 149))   {mcp4013pulses = 32;}
    if ((ana8 >= 150  )  && (ana8 <= 154))   {mcp4013pulses = 33;}
    if ((ana8 >= 155  )  && (ana8 <= 159))   {mcp4013pulses = 34;}
    if ((ana8 >= 160  )  && (ana8 <= 164))   {mcp4013pulses = 35;}
    if ((ana8 >= 165  )  && (ana8 <= 169))   {mcp4013pulses = 36;}
    if ((ana8 >= 170  )  && (ana8 <= 174))   {mcp4013pulses = 37;}
    if ((ana8 >= 175  )  && (ana8 <= 179))   {mcp4013pulses = 38;}
    if ((ana8 >= 180  )  && (ana8 <= 184))   {mcp4013pulses = 39;}
    if ((ana8 >= 185  )  && (ana8 <= 189))   {mcp4013pulses = 40;}
    if ((ana8 >= 190  )  && (ana8 <= 194))   {mcp4013pulses = 41;}
    if ((ana8 >= 195  )  && (ana8 <= 199))   {mcp4013pulses = 42;}
    if ((ana8 >= 200  )  && (ana8 <= 204))   {mcp4013pulses = 43;}
    if ((ana8 >= 205  )  && (ana8 <= 209))   {mcp4013pulses = 44;}
    if ((ana8 >= 210  )  && (ana8 <= 214))   {mcp4013pulses = 45;}
    if ((ana8 >= 215  )  && (ana8 <= 219))   {mcp4013pulses = 46;}
    if ((ana8 >= 220  )  && (ana8 <= 224))   {mcp4013pulses = 47;}
    if ((ana8 >= 225  )  && (ana8 <= 229))   {mcp4013pulses = 48;}
    if ((ana8 >= 230  )  && (ana8 <= 234))   {mcp4013pulses = 49;}
    if ((ana8 >= 235  )  && (ana8 <= 239))   {mcp4013pulses = 50;}
    if ((ana8 >= 240  )  && (ana8 <= 244))   {mcp4013pulses = 51;}
    if ((ana8 >= 245  )  && (ana8 <= 249))   {mcp4013pulses = 52;}
    if ((ana8 >= 250  )  && (ana8 <= 255))   {mcp4013pulses = 53;}
}
    top_mcp4013();      //top out the mcp4013
    mcp4013_csout = 1;  //disable mcp4013
    mcp4013_csout = 1;
    mcp4013_udout = 0;  //ready to decrement
    mcp4013_udout = 0;
    mcp4013_csout = 0;  //enable mcp4013
    mcp4013_csout = 0;
    for (i== 0; i== mcp4013pulses; i++){
    mcp4013_udout = 1;  //pulse it to the level
    mcp4013_udout = 1;
    mcp4013_udout = 0;
    mcp4013_udout = 0;
    }
    mcp4013_csout = 1;
    mcp4013_csout = 1;  //disable mcp4013
return;
 
}
 
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if I try compiling using MPLABX with XC8 your code with the modification
Code: 
void main(void) {
OSCCON = 0x50;         // line added
that line gives no errors
however, the line
Code: 
if ((ana8 >= 235) && (ana8 <= 255)) {mcp4013pulses = 31;}
and a few others give warnings
Code: 
main.c:502: warning: (750) constant operand to || or &&
main.c:502: warning: (765) degenerate unsigned comparison
main.c:524: warning: (765) degenerate unsigned comparison
main.c:529: warning: (750) constant operand to || or &&
main.c:529: warning: (765) degenerate unsigned comparison
if ana8 is a UNIT8 the expression (ana8 <= 255) is always true???
 
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that line gives no errors
Click to expand...
As expectable because OSCCON is defined as unsigned char in PIC18F65K22 include file.
 
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thanks, so I have to use OSCCON = b'01010000'?

I see the 255 point.....true...at least its just harmless stupidity on my part
 

treez said:
thanks, so I have to use OSCCON = b'01010000'?

I see the 255 point.....true...at least its just harmless stupidity on my part
Click to expand...
the simulator watch window shows 0x50
PIC18simulator.jpg
 
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General warning: although 'goto' is a valid instruction in C, you will regret using it later! In a large program it is like a signpost to go somewhere but you are never sure where or other places you might reach it from without looking through the rest of the code. Try to structure your programs in a more modular fashion and avoid the 'goto' instruction if possible.

Your mistake as already pointed out though is mixing variable sizes. An 8-bit value can never exceed 0xff/255.

Incidentally, I think you used the quote facility to post your code. If you use code tags instead (mouse over the icons to see which one) it will retain the formatting and indentation of the original program.

Brian.
 

treez said:
thanks, so I have to use OSCCON = b'01010000'?

I see the 255 point.....true...at least its just harmless stupidity on my part
Click to expand...
also in the statement
Code: 
if ((ana8 >= 0) && (ana8 <= 24))    {mcp4013pulses = 53;}
if ana8 is unsigned the expression (ana8 >= 0) is always true
 

thanks
Your mistake as already pointed out though is mixing variable sizes. An 8-bit value can never exceed 0xff/255.
Click to expand...
I hope I haven't mixed variable sizes, I wish all the variables to be just 8 bit.

- - - Updated - - -

i see your point about goto........im sure you are right and theres a better way. In this code, i found i was returning back to main at the point just after where i left for the function in the first place......but i often wanted to return back to the start of main, so i just added an "if" and a goto to shovel execution back to the start of main......do you think that goto'ing when you only goto the start is slightly less bad..i appreciate that jumping all over the place is getting crazy....but when you only ever jump back to the start point its a little less mad
 

could you do something along the lines of
Code: 
 while(1){
   int exit=0;
   OFF1;
   OFF2;
   OFF3;
   FANOFF;
 
   read_dips();
   if (currentint == 1) exit=1;
 
   while(!exit)
    {
    if (dipsw1)  pre_internal();  //OFF (actually high) = INTERNAL MODE
    if (currentint == 1) exit=1;
    if (dipsw1)  internalmode();
    if (currentint == 1) exit=1;
    if (dipsw1) continue;
 
    if (!dipsw1) pre_external();
    if (currentint == 1) exit=1;
    if  (!dipsw1) externalmode();
    if  (currentint == 1) exit=1;
    }
   }

or even
Code: 
  while(1){
   OFF1;
   OFF2;
   OFF3;
   FANOFF;
 
   read_dips();
   if (currentint == 1) continue;
 
   while(1)
    {
    if (dipsw1)  pre_internal();  //OFF (actually high) = INTERNAL MODE
    if (currentint == 1) break;
    if (dipsw1)  internalmode();
    if (currentint == 1) break;
    if (dipsw1) continue;
 
    if (!dipsw1) pre_external();
    if (currentint == 1) break;
    if  (!dipsw1) externalmode();
    if  (currentint == 1)break;
    }
}
 
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